Reversing valve



H. HELLAN REVERS ING VALVE July 28, 1936.

Filed April lO, 1930 f ff INVENTOR. ,Z/

A TTORNE Y.

Patented July 28, 1935 smear ossles nEvEasiNo VALVE Haakon Hellan,Chicago,l lll. Application April V10, 1938, Serial No. 443,090

3 Claims. 'My invention relates to reversing valves for regenerativefurnaces. x

My invention-relates to the control of air to andwaste gas fromregenerative furnaces, such -asbpen hearths and glass tanks. VIt belongsto the class of valves using a damper (gate valve) sliding against aWater cooled metallic seat forv shutting 01T and opening to stack in theunderground flue system,where temperatures range around 1500 F. Presentpractice oiers dampers of different construction. Brick dampers in metalframes are porous. A solidly cast metal damper, Whether in one piece orin sections, will warp and cause leaks. All-Water cooled dampers oftight box construction require clean water to avoid settling out ofsediments, and large quantities of the water on account of the largeexposed area to the heat.

One object of my invention is to provide a damper construction thatinsures tightness by Water cooling, but reduces water requirements tocooling of contacting parts only, and by its construction permits theuse of raw water in constant circulation.

Another object is to construct the main area of the damper of a lightmetal plate to withstand the heat, and avoid the heat losses fromexcessive water cooling.

Another object is to provide an arrangement of damper and the air inletinto one vertical iiue passage, principally for saving of oor space,

sage to regenerator flue, said passage having one side formed by thedamper.

Another object is to provide a gate valve with novel cooling meanscomprising a metal frame approximating the size and shape of the seat land provided with a removable plate covering the frame opening.

Referring to the accompanying drawing, Fig. 1 is a. vertical section ofthe valves and adjacent elements for one side of a regenerative furnace,parts being in elevation. Fig. 2 is a section on the line 2--2 on Fig.1.

On the drawing, I is a damper adapted to the seat 2 between theregenerator iiue 3 and the stack ue Il. 5 is a passage by which all.'iS. Qonducted to the flue 3 after passing through the conduit 6 and thevalve-chamber;1. A vertically-reciprocating `valve 8 of thesaucer or'cone'V type is adapted to close the valvev seat9-in the bottom ofthechamber 1. Y l 5` The seat 2 is a metal, frame having therein a watercooling passage I8 provided with the inlet'an'doutlet ducts II and I2.Thevdamper'comprises'al-metal frameV I3 having substantially theshapeand size of the seat 2. This frame is pro- 10 vided With a Watercooling passage lI4, having-the inlet and outlet pipes I5 and IS Ywhichslide in openings inthe upper wall of the shaft or-pasu sage 5. Thepipes l5 and I6 are provided with flexible hose, one marked I 1supplying the pipe l5 I6. It Will be understood that another hose likeI'I is to be connected to the pipe I5. The damper I is inclined towardthe stack flue. The upper edge of the frame I3 has attached thereto therod I8 reciprocable through the upper wall of 20 the port and airpassage 5. This rod is connected above the air passage 5 by the rope I9to the drum on the shaft 2|. On the same shaft is the smaller drum 22provided With the rope 23 which runs over the sheave 24 which is 25attached to the stem 25 of the valve 8.

With the parts as shown on the drawing, air would pass down through theconduit, theV valve chamber 'I, the air passage 5 and the regenerator ueand thence on to the regenerator, not shown, the air contacting with thevalve I as it enters the flue 3 whereby the valve is somewhat cooled andthe air somewhat heated. From the regenerator the air having been heatedthereby passes to a furnace, the Waste gases passing from the furnacethrough a second regenerator and regenerator flue into the stack flue 4at the opposite end of that shown on the drawing. As the connection ofreversing valves to a regenerative furnace is old and well-known and asthis invention relates entirely to the valve construction andarrangement, the regenerators, the furnaceand the second set of valveslike that shown have all been omitted. It will be readily l understoodthat there will be at the right of Fig. 4,5 1 a second set of valveslike I and 8 arranged to be operated so that when the damper I isclosedand the air inlet valve 8 is open, the corresponding valves in the othervalve unit will be in reverse position.

It will be noted that the damper frame I3 is provided with a cover plate26 removably secured to the frame I3 by means of bolts 2l or equivalentdevices. It will be seen that when the air which is fed under pressurepasses from the passage 5 55 It will also be noted that the air closed.The ropespl'S and 23 are-wound in reverse directions on the drums 20 and22Yso that when the shaft 2| is rotated to move the valves l. and 8 theyare always moved so that one is open andY Y j the other is closed. 3 Myhollow damper frame corresponds in shape and size to the damper seat,and isrfmuchV better thanrit would berif the water cooling portionYwere Va large chamber having V substantially the area 'of the valve.l,With my frameV provided with a circulating uid the rapid movement ofthe water therein prevents the settling of any sediment. With a damperwith a large water-cooled chamber having the same farea as the damper,the Vcirculation of water is much slower: so'Y that sediment willgradually gather and cut-off the-circulation of water from Y at least alarge portion of the damper. Thus,y the frame 'of jmyy damper willY bepreserved much longer than it 4would be if the water circulated Y Y Ythrough a hollow substantially the size of the Y damper.,A Should theplate 26 be burned-out it is but a small matter to supply anotherin itsplace. Y

Y 1;Y In a damper construction adapted to be sub'-V jected to intenseheat, a damper comprising a hollow framev `member providing apassagewayfor a cooling medium to preserver the same'from the destructive effectof heat, said frame member 'having anV opening therethrough, and aninde'- '21 Y f Y f 2,048,696

pendent continuous thin metal cover plate com-` pletely covering saidopening, Y separate fromY but mechanically attached at itsY edges tosaid frame member, whereby warping or expansion strains in the' platedue to heat Ywill not causefdistortion of said cooled frame.

2. In a damper construction adapted to besubjected to Yintense heat, adamper comprising a hollow frame member providing a passageway for aYcoolingpmedium to Vpreserve the'same from the'destructive eiect of heat,said Vframelmember Ulf having an opening therethrough,y and an inde- Ypendent continuous thin metal cover plate corn-v pletely covering saidopening, separate Vfrom but "removablyrattached at its edges to saidframe member, whereby warping or expansionstrains in the plate due toheat will not cause distortion of said cooled frame,V n Y 3. In a damperconstruction for a regenerative furnace provided with a -reg'eneratorvilue and a stack flue, a vertical'air passage separating said ilues, adamper seat with Yan opening registering'i Y with the stack ilue,'adamper adaptedrto rest against said seat or Yto belifted in said airpassage;Y and a main airV inle'tjfor supplying ff air "to the furnace,said-,inlet opening into Ysaid'airpassage at a Vpointremoved from'Vsaidk damper "Whenf Y raisedbut in a position to Vconstitute means fordirecting the Yairflowfagainstrthe side ofthe-V damper away fromits`seat to aids'ubstantially in holding Ythe damper on itsseat.V Y e

